4.19-stable review patch. If anyone has any objections, please let me know.
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From: RD Babiera rdbabiera@google.com
commit 5962ded777d689cd8bf04454273e32228d7fb71f upstream.
When typec_altmode_put_partner is called by a plug altmode upon release, the port altmode the plug belongs to will not remove its reference to the plug. The check to see if the altmode being released is a plug evaluates against the released altmode's partner instead of the calling altmode, so change adev in typec_altmode_put_partner to properly refer to the altmode being released.
Because typec_altmode_set_partner calls get_device() on the port altmode, add partner_adev that points to the port altmode in typec_put_partner to call put_device() on. typec_altmode_set_partner is not called for port altmodes, so add a check in typec_altmode_release to prevent typec_altmode_put_partner() calls on port altmode release.
Fixes: 8a37d87d72f0 ("usb: typec: Bus type for alternate modes") Cc: stable@vger.kernel.org Co-developed-by: Christian A. Ehrhardt lk@c--e.de Signed-off-by: Christian A. Ehrhardt lk@c--e.de Signed-off-by: RD Babiera rdbabiera@google.com Tested-by: Christian A. Ehrhardt lk@c--e.de Acked-by: Heikki Krogerus heikki.krogerus@linux.intel.com Link: https://lore.kernel.org/r/20240103181754.2492492-2-rdbabiera@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/typec/class.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/usb/typec/class.c +++ b/drivers/usb/typec/class.c @@ -188,11 +188,13 @@ static void typec_altmode_put_partner(st { struct altmode *partner = altmode->partner; struct typec_altmode *adev; + struct typec_altmode *partner_adev;
if (!partner) return;
- adev = &partner->adev; + adev = &altmode->adev; + partner_adev = &partner->adev;
if (is_typec_plug(adev->dev.parent)) { struct typec_plug *plug = to_typec_plug(adev->dev.parent); @@ -201,7 +203,7 @@ static void typec_altmode_put_partner(st } else { partner->partner = NULL; } - put_device(&adev->dev); + put_device(&partner_adev->dev); }
static int __typec_port_match(struct device *dev, const void *name) @@ -459,7 +461,8 @@ static void typec_altmode_release(struct { struct altmode *alt = to_altmode(to_typec_altmode(dev));
- typec_altmode_put_partner(alt); + if (!is_typec_port(dev->parent)) + typec_altmode_put_partner(alt);
altmode_id_remove(alt->adev.dev.parent, alt->id); kfree(alt);